Device for recovering alkali in printing and dyeing desizing and alkali-minimization wastewater by membrane process

Abstract

The utility model relates to a device for recovering alkali in printing and dyeing desizing and alkali minimization wastewater by a membrane process, which comprises a water storage shell, a pressurizing mechanism fixed in the water storage shell and a filtering and purifying mechanism mounted in the water storage shell. Impurities such as pva and starch in printing and dyeing wastewater mainly containing pva, printing and dyeing wastewater mainly containing starch and alkali-minimization wastewater can be filtered, and alkali in the wastewater can be recovered.

Description

Technical Field

[0001] The utility model relates to the technical field of textile, in particular to a device for recovering alkali in printing and dyeing desizing and alkali reduction wastewater by a membrane process. Background Art

[0002] In the printing and dyeing industry, desizing and alkali reduction are two key steps, which involve the extensive use of alkaline chemicals to remove the sizing and other impurities on the fabric. The wastewater generated by these processes contains high concentrations of alkali and other organic or inorganic substances, posing a serious threat to the environment. If untreated or partially treated wastewater is directly discharged, it will cause the pH value of the water body to rise, damage the natural ecosystem, and affect the survival of aquatic organisms. Traditional wastewater treatment methods such as neutralization and precipitation can remove some pollutants, but they often have difficulty in completely removing dissolved solids and recovering the alkali in the wastewater, and the treatment efficiency is not high. Moreover, when evaporating and purifying alkali, alkali crystals are likely to adhere to the heating tubes, reducing the evaporation efficiency of the heating tubes. Therefore, there is an urgent need to set up a device that can purify and recycle sewage to solve the above problems. Content of the Utility Model

[0003] (1) Technical Problems to be Solved

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a device for recovering alkali in printing and dyeing desizing and alkali reduction wastewater by a membrane process, which solves the problems existing in the prior art. Through a carefully designed filtering mechanism, impurities such as PVA and starch in printing wastewater mainly containing PVA, printing wastewater mainly containing starch, and alkali reduction wastewater can be filtered, and the alkali in the wastewater can be recovered. Through a carefully designed purification heating tube, local heating of the water body can be prevented by convection, and crystallization is generated in advance and adheres to the heating tube, improving the evaporation efficiency of the heating tube.

[0005] (2) Technical Solutions

[0006] To achieve the above purpose, the utility model provides the following technical solutions: A device for recovering alkali in printing and dyeing desizing and alkali reduction wastewater by a membrane process, characterized in that it includes a water storage shell, a pressurizing mechanism fixed inside the water storage shell, and a filtering and purification mechanism installed inside the water storage shell;

[0007] The filtering and purification mechanism includes a preliminary filtering box installed inside the water storage shell, a top cover installed at the upper end of the preliminary filtering box, a preliminary filter installed on the side of the top cover, an alkali purification box installed on the side of the preliminary filtering box, a lifting ring installed at the upper ends of the preliminary filtering box and the alkali purification box, and a reverse osmosis membrane filter installed on the side of the alkali purification box;

[0008] A heating tube is installed at the bottom of the alkali purification box.

[0009] Preferably, the outer shell of the water storage shell is a cuboid without a cover structure, with a partition plate welded inside. There is a hole on the partition plate. The motor mounting plate is welded to the side of the partition plate, the first positioning plate is welded above the motor mounting plate, and the second positioning plate is welded to the bottom of the shell, with a distance of 800 mm from the first positioning plate.

[0010] Preferably, there is a hole on the side of the preliminary filtration box close to the partition plate, which is the same size and coaxial with the hole on the partition plate.

[0011] Preferably, one end of the water pump of the pressurization mechanism is connected to the opening on the partition plate, and the other end is connected to the opening on the preliminary filtration box.

[0012] Preferably, the top cover is a semi-circular shape with a diameter of one meter.

[0013] Preferably, the heating tubes are right-angled triangles, with a total of two groups and eight tubes, and the inclined surfaces are all set to the left.

[0014] (III) Beneficial effects

[0015] The purpose of the present utility model is to provide a device for recovering alkali from printing and dyeing desizing and alkali reduction wastewater by membrane method, which is specifically used for recovering alkali from printing and dyeing desizing and alkali reduction wastewater. By integrating the pressurization mechanism, the filtration and purification mechanism, and a special heating system, the device not only improves the recovery rate of alkaline substances but also optimizes the energy efficiency ratio of the system, providing an innovative solution for wastewater treatment and resource recovery in the printing and dyeing industry. Brief description of the drawings

[0016] Figure 1 It is the overall schematic diagram of the present utility model.

[0017] Figure 2 It is the schematic diagram of the filtration and purification mechanism in the present utility model.

[0018] Figure 3 It is the schematic diagram of the bottom of the alkali purification box in the present utility model.

[0019] Figure 4 It is the schematic diagram of the heating tube setting in the present utility model.

[0020] Figure 5 It is the schematic diagram of the water storage shell in the present utility model.

[0021] In the figure: 1 - water storage shell; 2 - pressurization mechanism; 3 - filtration and purification mechanism; 101 - outer shell; 102 - partition plate; 103 - motor mounting plate; 104 - first positioning plate; 105 - second positioning plate; 301 - preliminary filtration box; 302 - top cover; 303 - preliminary filter; 304 - alkali purification box; 3041 - heating tube; 305 - lifting ring; 306 - reverse osmosis membrane filter Detailed implementation manners

[0022] The following will combine with the attached drawings in the examples of the present utility model Figures 1-4 The technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] The present utility model provides a technical solution: a device for recovering alkali in printing and dyeing desizing and alkali reduction wastewater by a membrane process, which includes a water storage shell 1, a pressurizing mechanism 2 fixed inside the water storage shell, and a filtration and purification mechanism 3 installed inside the water storage shell;

[0024] The filtration and purification mechanism 3 includes a preliminary filtration box 301 installed inside the water storage shell 1, a top cover 302 installed at the upper end of the preliminary filtration box, a preliminary filter 303 installed on the side of the top cover, an alkali purification box 304 installed on the side of the preliminary filtration box 301, a lifting ring 305 installed at the upper ends of the preliminary filter box 303 and the alkali purification box 304, and a reverse osmosis membrane filter 306 installed on the side of the alkali purification box; The top cover 302 is installed at the upper end of the preliminary filtration box 301, and the preliminary filter is installed on the side of the top cover. The filter element of the preliminary filter 303 is an MF filter element. When the sewage passes through the preliminary filter 303, a certain pressure is required. When the pressurizing mechanism 2 pumps water into the preliminary filtration box 301, it ensures that there is always a certain pressure in the preliminary filtration box 301, ensuring that the preliminary filter 303 can work normally and efficiently, realizing the separation of starch. The alkali purification box 305 is installed on the side of the preliminary filtration box 301 to receive the filtered water flowing out of the preliminary filter 303 and store water for the next filtration procedure. The reverse osmosis membrane filter 306 installed on the side of the alkali purification box 304 is used to separate alkali. The molecular size of alkali is very small. This filter uses a reverse osmosis membrane, and a relatively large pressure is required for water to pass through this filter membrane. Therefore, the reverse osmosis membrane filter 306 is 1.5 m away from the top of the alkali purification box 304 and can provide a pressure of 1.5 Mpa. After filtration, the water flows out into the water storage tank 1, and the water containing alkali will be left in the alkali purification box 304. The lifting rings 305 installed at the upper ends of the preliminary filter box 303 and the alkali purification box 304 are used to lift out the preliminary filter box 303 and the alkali purification box 304 after purification to recover the alkali therein and clean the impurities.

[0025] A heating tube 3041 is installed at the bottom of the purification box 304. The heating tube is used to heat the alkali solution remaining in the alkali purification box, evaporate the water, and recover the alkali in the water.

[0026] The outer shell 101 of the water storage shell 1 is a cuboid without a lid. A partition plate 102 is welded inside. There is a hole on the partition plate 102. The motor mounting plate 103 is welded to the side of the partition plate 102. The first positioning plate 104 is welded above the motor mounting plate 103. The second positioning plate 105 is welded to the bottom of the outer shell 101 and is 800 mm away from the first positioning plate 104. The partition plate 102 is welded inside the water storage shell 1, dividing the water storage shell into two areas. The right side is used for the precipitation of sewage to prevent large particles of impurities from being sucked into the pressurization mechanism, causing damage to the pressurization mechanism 2 and blocking the preliminary filter 303. The hole on the partition plate 102 is located in the upper water layer to prevent the pressurization mechanism 2 from sucking in larger impurities and affecting the operation of the equipment. The motor mounting plate 103 is welded to the side of the partition plate 102. The motor mounting platform 103 is used to mount the pressurization mechanism 2 to ensure the stable operation of the pressurization mechanism. The first positioning plate 104 is welded above the motor mounting plate 103. The second positioning plate 105 is welded to the bottom of the outer shell 101. The two positioning plates are used for the fixation of the preliminary filter box 301 and the alkali purification box 304, and are arranged vertically with a large opening, facilitating the hoisting operation.

[0027] There is a hole on the side of the preliminary filter box 301 close to the partition plate 102, which is the same size as and coaxial with the hole on the partition plate 102. The shortest distance between the two holes improves the operating efficiency of the pressurization mechanism.

[0028] One end of the water pump of the pressurization mechanism 2 is connected to the hole on the partition plate 102, and the other end is connected to the hole on the preliminary filter box. The pressurization mechanism 2 is used to press sewage into the preliminary filter box 301 to ensure a certain pressure in the preliminary filter box 301, making the filtration more efficient.

[0029] The top cover 302 is a semi-circular shape with a diameter of one meter. A certain pressure needs to be maintained inside the preliminary filter box 301. The cylindrical internal structure of the preliminary filter box 301 and the semi-circular structure of the top cover 302 can ensure the safety of the container under the pressurization of the pressurization mechanism 2.

[0030] The heating tubes 3041 are right-angled triangles, with a total of two groups and eight tubes. The inclined surfaces are all set to the left. The four tubes on the left are the first group of heating tubes, and the four tubes on the right are the second group of heating tubes. Before the water boils, the temperature of the first group of heating tubes is 20 °C lower than that of the second group of heating tubes. Due to the 20 °C temperature difference between the first group and the second group of heating tubes, the water flow will rise at the second group of heating tubes and drop at the first group of heating tubes, forming a convection. Since the inclined surfaces of the heating tubes all face the left, the water flow will continuously wash the surface of the heating tubes, preventing the local water temperature from rising and causing alkali crystallization to hang on the surface of the heating tubes. When the water starts to boil, the temperature of the first group of heating tubes rises to the same as that of the second group of heating tubes.

[0031] Working principle:

[0032] Pour the printing and dyeing desizing wastewater and alkali reduction wastewater into the sewage sedimentation area of the water storage shell 1, and let it stand for 30 - 60 minutes. Then turn on the power of the pressurization device 2. The pressurization device presses the upper-layer sewage into the preliminary filtration box 301. When the preliminary filtration box 301 is full of water, the pressurization device 2 continues to press the water into the preliminary filtration box 301, and the water will enter the preliminary filter 303. Starch and other impurities with larger molecular sizes will be blocked by the preliminary filter 303, and the alkali solution will flow through the preliminary filter 303 and flow into the alkali purification box 304. When the water level in the alkali purification box 304 is higher than that of the reverse osmosis membrane filter 306, the alkali solution will be filtered by the reverse osmosis membrane filter 306. The alkali will be blocked, and the water will flow out through the reverse osmosis membrane filter 306. After 1 - 2 hours, turn off the pressurization device 2, and turn on the heating pipe 3041 at the bottom of the alkali purification box 304 to evaporate the excess water to obtain the recoverable alkali.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for recovering alkali from desizing and alkali reduction wastewater by membrane process, characterized in that: It comprises a water storage shell (1), a pressurizing mechanism (2) fixed inside the water storage shell, and a filtering and purifying mechanism (3) installed inside the water storage shell; The filtering and purification mechanism (3) comprises a preliminary filtering box (301) installed inside the water storage shell (1), a top cover (302) installed on the upper end of the preliminary filtering box, a preliminary filter (303) installed on the side of the top cover, an alkali purification box (304) installed on the side of the preliminary filtering box (301), a hanging ring (305) installed on the upper ends of the preliminary filtering box (301) and the alkali purification box (304), and a reverse osmosis membrane filter (306) installed on the side of the alkali purification box (304); A heating pipe (3041) is installed at the bottom of the alkali purification box (304).

2. The device for recovering alkali from desizing and alkali reduction wastewater by membrane process according to claim 1, characterized in that: The outer shell (101) of the water storage shell (1) is a rectangular structure without a cover. A water baffle (102) is welded inside the outer shell (101) of the water storage shell (1). A hole is opened on the water baffle (102). The motor mounting plate (103) is welded to the side of the water baffle (102). The first positioning plate (104) is welded above the motor mounting plate (103). The second positioning plate (105) is welded to the bottom of the outer shell (101) and is 800 mm away from the first positioning plate (104).

3. The device for recovering alkali from desizing and alkali reduction wastewater by membrane process according to claim 1, characterized in that: The preliminary filter box (301) has a hole on one side close to the water barrier (102) which is the same size and coaxial with the water barrier (102).

4. The device for recovering alkali from desizing and alkali reduction wastewater by membrane process according to claim 1, characterized in that: One end of the water pump of the boosting mechanism (2) is connected to an opening on the water baffle (102), and the other end is connected to an opening on the preliminary filter box (301).

5. The device for recovering alkali from desizing and alkali reduction wastewater by membrane process according to claim 1, characterized in that , the top cover (302) is semicircular with a diameter of one meter.

6. The device for recovering alkali from desizing and alkali reduction wastewater by membrane process according to claim 1, characterized in that The heating tube (3041) is a right triangle, with two groups of eight tubes, and the inclined surfaces are all set to the left.

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